#!/usr/bin/env python3

import tempfile
from pathlib import Path

from gen_api import ROOT, parse, render


with tempfile.TemporaryDirectory(dir=ROOT) as directory:
    source = Path(directory) / "wrapped.cpp"
    source.write_text(
        """// @lua-module fs FsLib
// @lua-const MAX_READ_BYTES integer 65536 Largest portable
// whole-file read.
const luaL_Reg FUNCTIONS[] = {
    // --- Reads one complete
    // file.
    // @param path string Absolute file
    // path.
    // @return string|nil File
    // contents.
    {"readFile", readFile},
};
"""
    )
    module = parse(source)[0]

assert module["consts"][0][3] == "Largest portable whole-file read."
doc = module["functions"][0][1]
assert doc["doc"] == ["Reads one complete file."]
assert doc["params"][0][2] == "Absolute file path."
assert doc["returns"][0][1] == "File contents."

# Callbacks render as fields of a class an app composes, never as global functions.
with tempfile.TemporaryDirectory(dir=ROOT) as directory:
    source = Path(directory) / "handlers.cpp"
    source.write_text(
        """// @lua-app TouchHandlers
// @lua-field home? string The route back lands on.
// ---Fired when the finger lands.
// @param x integer
// @param y integer
// @lua-fn onTouchDown?
// ---Mounts the route.
// @param route string
// @param arg string|nil
// @lua-fn start
"""
    )
    output = render(source, parse(source))

assert "---@class TouchHandlers" in output
assert "---@field home? string The route back lands on." in output
assert "---@field onTouchDown? fun(x: integer, y: integer) Fired when the finger lands." in output
assert "---@field start fun(route: string, arg?: string) Mounts the route." in output
assert "function " not in output
print("ok")